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  • 1
    Electronic Resource
    Electronic Resource
    Studies on the anodic decomposition products of sulfamate (1994)
    Springer
    Journal of applied electrochemistry 24 (1994), S. 1182-1187 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The anodic oxidation of sulfamate, products of which are known to significantly affect the quality of nickel deposits in a nickel electroforming bath, has been studied. Sulfamate was oxidized electrochemically at a platinum electrode in aqueous solution of initial pH 12 and 2, and one of the decomposition products produced therefrom, which had not been identified in the literature, was separated by means of paper chromatographic methods and subjected to spectroscopic analysis. The compound is produced at an applied potential more positive than 1.2 and 1.8 V vs Ag/AgCl, saturated KCl electrode in alkaline and acidic media, respectively. The analysis indicates that the compound has spectroscopic and chromatographic characteristics consistent with a new, thus far unknown compound, diimide S-sulfonate, H2N=N-S-SO3 which may have two different tautomeric structures. An oxidation mechanism for sulfamate consistent with the generation of this product is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241319
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  • 2
    Electronic Resource
    Electronic Resource
    Destruction of aniline by mediated electrochemical oxidation with Ce(IV) and Co(III) as mediators (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 685-691 
    Details
    ISSN: 1572-8838
    Keywords: aniline ; electrocatalyst ; intermediate species ; kinetic parameters ; mediated electrochemical oxidation (MEO) ; waste water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Mediated electrochemical oxidation has been employed to test the feasibility of treating soluble organic wastes. We report Ce(IV)- and Co(III)-mediated electrochemical oxidation of aniline at various electrodes in acidic media as an example of organic waste. Aniline was oxidized by an electrogenerated electron transfer mediator, Ce4+ or Co3+, in the anolyte and carbon dioxide was produced as a final oxidation product. Carbon dioxide was collected by bubbling through a barium hydroxide solution. When a powerful oxidizing agent, Ce(IV) or Co(III), was used as an electron shuttling mediator, parameters affecting the coulombic efficiency for aniline oxidation were the standard oxidation potentials of the mediators, their concentrations and the reaction temperature. Intermediate species produced during the oxidation of aniline were identified by cyclic voltammetric and absorption spectroscopic measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004020100679
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  • 3
    Electronic Resource
    Electronic Resource
    Elucidation of anaplerotic pathways in Corynebacterium glutamicum via 13C-NMR spectroscopy and GC-MS (1997)
    Springer
    Applied microbiology and biotechnology 47 (1997), S. 430-440 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We have obtained direct evidence indicating the presence of pyruvate-carboxylating activity in Corynebacterium glutamicum, a lysine-overproducing bacterium. This evidence was obtained through the use of 13C nuclear magnetic resonance (NMR) spectroscopy and gas chromatography/mass spectrometry (GC-MS) of secreted metabolites in a lysine fermentation. The distribution of 13C label after multiple turns in the tricarboxylic acid cycle was accounted for properly to obtain predictions for [13C] metabolite enrichments that were employed in the interpretation of 13C-NMR and GC-MS data. Of critical importance in arriving at the conclusions was the use of C. glutamicum mutants with deletions of the pyruvate kinase and/or phosphoenolpyruvate carboxylase enzymes. Our results demonstrate the presence of pyruvate-carboxylating pathway(s) in C.␣glutamicum operating simultaneously with phosphoenolpyruvate carboxylase, with the latter enzyme contributing approximately 10 % of the total oxaloacetate synthesis during the lysine-production phase with pyruvate and gluconate as carbon sources. These findings are important for developing strategies to increase the total carbon flux for synthesis of amino acids of the aspartate family through metabolic engineering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050952
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  • 4
    Electronic Resource
    Electronic Resource
    Internal oxidation of Ag-in alloys: Stress relief and the influence of imposed strain (1986)
    Springer
    Oxidation of metals 26 (1986), S. 77-100 
    Details
    ISSN: 1573-4889
    Keywords: Ag-In alloys ; internal oxidation ; stress-relief mechanism ; pipe diffusioncontrolled creep model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The kinetics of internal oxidation of silver-indium alloys containing 3.5, 5.9, and 9.8 at.% In in air at temperatures 773 to 973 K were established by TGA with no load applied to the specimens. Silver nodules free of oxide particles were observed to form at the surface during internal oxidation. The volume of these silver nodules was comparable to the total volume increase caused by internal oxidation. The alloys were also creep tested during oxidation in air at creep rates varying from 10−7 to 5×10−5 s−1 at 773, 873, and 973 K. The parabolic rate constants kp for the internal oxidation of the solute were determined from the measured widths of the internal oxidation zones. A small increase in kp was observed with increased strain rate. The large volume change associated with internal oxide formation resulted in a stress gradient between the stress-free surface and the internal oxidation front which is under a high compressive stress. Stress relief occurred by transport of silver to the surface. A Nabarro-Herring creep type mechanism based on lattice diffusion of Ag cannot account for the high rate of silver transport to the surface. Pipe-diffusion controlled creep is proposed as the mechanism of stress accommodation by silver diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00664274
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  • 5
    Electronic Resource
    Electronic Resource
    Ionic conductivity of Na, K and Ag β″-alumina-ZrO2 composites (1994)
    Springer
    Journal of materials science 29 (1994), S. 2425-2430 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Composite samples of Na β″-alumina with 15 vol % Zr02 stabilized with 4.5 wt % Y2O3 were fabricated using two sintering schedules. K and Ag β″-alumina composites were prepared from the Na β″-alumina composite by ion exchange. The ionic conductivities of the Na, K, and Ag composites at 300 °C were 1.3×10−1, 5.9×10−2 and 6.8×10−3 S cm−1, respectively. K 1c for the K composite was as high as 3.7 MPam1/2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363436
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  • 6
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    Elucidation of anaplerotic pathways in Corynebacterium glutamicum via 13 C-NMR spectroscopy and GC-MS (1997)
    Springer
    Details
    Publication Date: 1997-04-14
    Print ISSN: 0175-7598
    Electronic ISSN: 1432-0614
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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  • 7
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    Ionic conductivity of Na, K and Ag β″-alumina-ZrO2 composites (1994)
    Springer
    Details
    Publication Date: 1994-05-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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